1. 6.1 Chromosomes and Meiosis
Set up Cornell Notes on pg. 73
Topic: 6.1 Chromosomes and Meiosis
Essential Question:
Where are germ cells located in the human body?
Draw a double-bubble map comparing and contrasting autosomes and sex chromosomes
Don’t forget to add it to your T.O.Contents!
6.1 Chromosomes and Meiosis
2.1 Atoms, Ions, and Molecules
Where are germ cells located in the human body?
Draw a double-bubble map comparing and contrasting autosomes and sex chromosomes
Key Concept: Gametes have half the number of chromosomes that body cells have

2. Sponge 1: Please correctly identify the phase of mitosis.2 1 3 4

3. Telophase Anaphase Prophase Metaphase
Sponge 1: Please correctly identify the phase of mitosis.
Telophase
Anaphase
Metaphase
Prophase

4. KEY CONCEPT Gametes have half the number of chromosomes that body cells have.

5. Mom
Dad
Human body cells have 23 pairs of chromosomes and 46 total
Each pair of chromosomes is called Homologous pairs and have copies of the same genes
In each pair, one chromosome comes from each parent.
*Homo= same

6. You have two types of specialized cells:
Somatic cells Germ cells

7. Somatic cells- are body cells and make up most of your body tissues and organs.
Liver cells
Lung cells
Heart cells etc…
Red blood cells
skin cells bone cells intestinal cells

8. Chromosome pairs 1-22 are called autosomes
Contain genes not directly related to your gender

9. Somatic (body) cells are Diploid (2n) cells have two copies of every chromosome (23 from mom, 23 from dad) for a total of 46 chromosomes
*di= 2 n n 2n

10. Germ cells- are the cells in your reproductive organs
located in the ovaries and testes
Develop into gametes

11. Gametes are sex cells: egg and sperm
Both have DNA that can be passed to offspring.
Egg
Sperm

12. Gametes are Haploid (n) cells have one copy of every chromosome.
Have 22 autosomes + 1 sex chromosome = 23 chromosomes each 23 23

13. XX XY XX= female XY= male Pair #23=Sex chromosomes: X and Y
determine gender
Control the development of sexual characteristics
XX= female
XY= male XX XY

14. Where are germ cells located in the human body (2 places)
Points to Ponder
Where are germ cells located in the human body (2 places)
Do you think that Y chromosomes contain genes that are critical for an organism’s survival? Explain.

15. Where are germ cells located in the human body (2 places)
Points to Ponder
Where are germ cells located in the human body (2 places)
In the reproductive organs: The ovaries in women and the testes in men.
2. Do you think that Y chromosomes contain genes that are critical for an organism’s survival? Explain.
No, a Y chromosome is not necessary for survival. Females do not have a Y chromosome, and they are able to survive.

16. Set up Cornell Notes on pg. 75 Topic: 6.1 Mitosis vs. Meiosis
Essential Questions:
Does mitosis or meiosis occur more frequently in your body? Explain.
Draw a double-bubble map comparing and contrasting mitosis and meiosis
Don’t forget to add it to your T.O.Contents!
6.1 Mitosis vs. Meiosis
2.1 Atoms, Ions, and Molecules
Does mitosis or meiosis occur more frequently in your body? Explain.
Draw a double-bubble map comparing and contrasting mitosis and meiosis

17. Two types of cell division:
Mitosis Meiosis

18. Mitosis= makes more diploid cells.
Produces genetically identical cells
Results in diploid cells (46 chromosomes)
Takes place throughout an organism’s lifetime
Involved in asexual reproduction

19. *Draw on pg. 74
DNA replicates
2 identical daughter cells

20. Meiosis= makes haploid cells (23) from diploid cells.
produces gametes (sperm/eggs)
Produces genetically unique cells
Takes place only at certain times in an organism’s life cycle
Involved in sexual reproduction

21. (diploid- 46)
*Draw on pg. 74
4 haploid (23)
unique daughter cells

22. Please open your book to page 172
Please read the Genetic Data information
Interpret the second bar graph and answer the 3 questions on the bottom of pg. 74
Title it “Genetic Data Chromosome Interpretation”

23. Diploid # of Chromosomes in Various Organisms
Y- axis
Dependent variable 10
210 20 40 40 49 55
X- axis
Independent variable

24. King crab; fruit fly
No. A porpoise is much bigger than a king crab, and has far less chromosomes. A potato is only 3 chromosomes off from human, and far smaller.
Yes. Chromosomes need to be able to fit in the nucleus.

25. Homework: Due by Monday 11/05!!!!
Make flashcards on index cards
Front- word Back- Picture and description/definition
6.1
Somatic cells
Gametes
Homologous chromosomes
Autosomes
Sex chromosomes
Sexual reproduction
Fertilization
Diploid
Haploid
Meiosis
6.4
Gene
Allele
Homozygous
Heterozygous
Genome
Genotype
Phenotype
Dominant
Recessive